Check out Mozilla’s Robert O’Callahan MediaStream Processing demos:
https://ftp.mozilla.org/pub/mozilla.org/firefox/try-builds/rocallahan@mozilla.com-6ac1418daa2e/

You need Firefox experimental nightly build:
http://people.mozilla.org/~roc/stream-demos/

You should try them, it is worth spending some time playing around with these demos. Start at the top of the list, and work yourself down, one at the time.